Availability zones and regions have different purposes. Availability zones protect against failures of individual hosts. Regions provide disaster recovery of the entire SDDC.

Availability zones

An availability zone is the fault domain of the SDDC. Multiple availability zones can provide continuous availability of an SDDC, minimize down time of services and improve SLAs.

Regions

Regions provide disaster recovery across different SDDC instances. Each region is a separate SDDC instance. The regions have a similar physical layer and virtual infrastructure designs but different naming.

The identifiers follow United Nations Code for Trade and Transport Locations(UN/LOCODE) and also contain a numeric instance ID.

Table 1. Availability Zones and Regions in Consolidated SDDC

Region

Availability Zone and Region Identifier

Region-Specific Domain Name

Region Description

A

SFO01

sfo01.rainpole.local

San Francisco, CA, USA based data center

Table 2. Design Decisions оn Availability Zones and Regions

Decision ID

Design Decision

Design Justification

Design Implication

CSDDC-PHY-001

Use a single region.

Supports the reduced footprint requested for use in a Consolidated SDDC.

Redundancy is limited to backup and restore because no additional region to fail over to is available.

CSDDC-PHY-002

Deploy a single availability zone to support all SDDC management components and tenant workloads.

Supports all SDDC management and tenant components for a region.

  • Using a single availability zone results in limited redundancy of the overall solution.

  • The single availability zone can become a single point of failure and prevent high-availability design solutions in a region.